Some addition reactions of bisgermavinylidene

The reaction of bisgermavinylidene [(Me3SiN = PPh2)(2)C = Ge -> Ge=C(PPh2 = NSiMe3)(2)] (1) with AdNCO (Ad = Adamantyl) afforded the [2 + 2] cycloadditon product [(Me3SiN = PPh2)(2)CGeC(O) NAd] (2). Similar reaction of I with Ph3SiOH in tetrahydrofuran (THF) yielded the base-stabilized germanium(II) triphenylsiloxide [H2C(PPh2 = NSiMe3)(2)Ge(OSiPh3)(2)] (3). The results suggested that reactive germavinylidene may exist in solution and is capable of forming addition reaction products. The X-ray structures of 2 and 3 were determined. Copyright (c) 2007 John Wiley & Sons, Ltd.